Oil burner



Feb. 20, 1923.

R. HOFFMAN OIL BURNER Filed July 10, 1 919 5 sheets-sheet; 1

R. HOFFMAN OIL, BURNER Filed July 10, 1919 5 sheets-sheet 5 Patented Feb. 20, 1923.

UNITED STATES PATENT QFFICE.

RUDOLPH HQFFMAN, OF KANKAKEE, ILLINOIS, ASSIGNOR TO SEARS, BOEBUCK AND (30., O1 CHICAGO, ILLINOIS,

a CORPORATION 017 NEW Yoax.

OIL BURNER.

Application filed July 10,

. Toall 'wlwm it may concern:

Be it known that I, RUDOLPH HOFFMAN, a citizen of the United States, residing at Kankakee, 6 State of Illinois, have invented certain new and useful Improvements in'Oil Burners, of which, the following is a speclficatlon. My invention relates to oil burners of the blue flame type, the general aim being to produce a burner of improved construct on and arrangement, including an improved manner of mounting the outer combustion tube, an improved construction for the inner combustion tube, and an improved wick stop device.

More specifically, one object of the invention is to provide means for supportmg the outer combustion tube so as to enable it to be readily moved from lowered position to a raised position w-hereby to facilitate the lighting operation.

Another object of the invention is to pro vide an inner combustion tube ,in' which the upper portion, which is subjected to the extreme heat, is made renewable. A 'further object of the invention is to provide a wick stop device of an advantageous character. Wick stop devices of the prior art have comprised. stop fingers'whlch, when the parts of the burner are in operative position, are positioned overthe wick, so that when this wick is lighted the-fingers lie in the flame. This arrangement-of the stop fingers is objectional for the reason that causing it to be consumed unevenly and also decreasing theeflectiveness of the flame. A special aim of this'invention is to provide a wick stop device of such character that the stop fingers are capable of being withdrawn from their operative position above the wick after having served their purpose in positioning the wick.

The objects of the invention thus gener view taken on line 2-2 of Fig. 5. Fig. 3"

I is a fragmentary detail view showing the in the county of Kankakee and they interfere with the burning of the wick,

1919. Serial No. 809,878.

means for supporting the outer combustion tube. Fig. 4 is an under side plan view of the burner, showing the wick stop operating device. Figs. 5, 6 and 7 are horizontal sections taken on the lines 5-5, -66 and 7-7 respectively, of Fig. 2. Fig. 8 is a fragmentary skeleton view showing the Wick stop device detached. Fig. 9 is a fragmentary sectional view taken on the line 9-9 of Fig. 8. Fig. 10 is a fragmentary elevation showing a detail of construction.

The burner comprises generally, the usual concentric wick tubes 1 and 2 spaced apart to provide an annular space for receiving a wick .3, an outer combustion tube 4 adapted to be seated upon the outer wick tube, and

an inner combustion tube 5. 6 indicates a crank arm by means of which the wick stop device including a series offl'stop fin ers 7 is manually operable to move the fingers into position above the wick stop.

The wick tubes 1 and 2 may be of any suitable construction, -forming at their lower ends a trough for oil in the usual way. The outer tube 1 carries the usual wick raising and lowering device 8 for the wick 3, and near the upper end of said tube 30 there is provided an annular seat 9 adapted to supportthe outer combustion tube in its norma or operative position.

The outer combustion tube 4, whiohmay be of any ordinary construction, is movable independently of the inner combustion tube. For this purpose it is provided at its lower end with an annular member 10 adapted to cooperate with a series of stationary pins 11 to support the tube either in a raised or lowered position with reference to the wick Said annular member is fixed upon the outer periphery of the tube 4 and flares outwardly and downwardlyso as to clear the annular seat member 9.

At its lower edge sald annular member 10 'is provided with a 'with stops in to limit the extent of rotation of the com- -be readily accomplished At their lower edges said lugs are provided the form of hooks 1d adapted bastion tube in one direction. I

..The parts are so proportioned and arranged that when the lugs are supported upon the pins, ported in raised osition with its lower end a substantial istance above the wick. When the'lugs are moved on from the pins,

said combustion tube is lowered until its lower end rests upon the seat member 9. Such rotation of the combustion tube may by grasping the handle 15 forming part ofthe means for supporting the burner drum (not shown). When thevcombustion tube is in its raised position it will be seen that oil is efiectively prevented from creeping upwardly thereon from the wick or the wick tubes. At the same time ready access to the wick is permitted from practically any side of the burner. In order that the annular member shall not interfere with the free passage of air to the wick through the lower end of the outer combustion tube, said member, including the lugs 12, is provided with a plurality of openings 16. Through these openings,

. when the combustion'tube is seated upon the said member 9, air is permitted to pass into the combustion space above the wick. I

The inner combustion tube 5 comprises an upper portion 5 and a lower portion 5 and is of a diameter slightly less than the inner wick tube 2 so that when supported centrally of said wick tube, the lower end of the combustion tube is spaced from the wick tube. To insure an even spacing of the combustion tube from the inner wick tube, a plurality of bosses 17 are provided at the lower end thereof which is arranged to depend a short distance into the inner wick tube.

The means for supporting the inner combustion tube 5 comprises a central rod 18 entered through an opening in the top wall 19. of the combustipn tube and extending downwardly to the lower end of the wick tubes where it is screw-threaded into a U shaped cross bar 20 fixed at its opposite ends to the wick tubes. Near its central portion,

' the combustion tube is provided with a perforated partition 21 fixed against vertical movement therein, and bearing between said partition and a nut 22 threaded onto the lower end of the rod 18 is a sleeve 23 surrounding said rod. For the purpose of holding the partition 21 against vertical movement. in the combustion tube, I provide a spider 24: having a central portion surrounding' the stem and a plurality of upturned arms 25 enga ing at their free ends with an annular shou der 26 formed at the upper end of the lower portion 5" of the combus- I tion tube.

The upper portion of the inner combusthe combustion tube 4 1s supincrease I tion tube 5 is in use subjected to extreme heat,,so that it frequently becomes necessary to renew the tube because of the gradual destruction of the upper portion thereof. ll

therefore make the combustion tube in two sections. These sections are or substantially the same diameter and the lower end of the 23. the latter being held against the partition 21 by means of the nut 22.

At the upper end of the lower portion 5? of the combustion tube 5, 1 preferably provide a partition 27 28 of substantial size adapted to permit of a restricted flow of air upwardly into the upper portion of the combustion tube. Similarly in the upper portion of the combustion tube, I provide a restricting partition 29 having a central aperture 30 therein.-

Ttwill be seen tube 5 is normally held against vertical movement by its supporting means, and in spaced relation with reference to the inner wick tube so that oil cannot creep upwardly thereon from the wick. Moreover, the combustion tube may be readily withdrawn as a unit by simply unscrewing the rod 18 from the cross bar 20, and when it is desired to disassemble the sections of the tube this may be readily accomplished by removing the nut 22 and slipping the sleeve 23 from oil the rod 18-. To'facilitate the removal of the rod 18, it has fixed on its upper end a member or head 31 having finger-engaging wings.

To enable from the wick, 1 preferably provide upon the inner combustiontube one or more wick scrapers 32 projecting outwardly therefrom and each comprising one or more upright walls 32 the lower edges of which are adapted to be engaged by the upper end of the wick when the latter is moved vertically by the device '8. Said walls may be formed integral, angularly disposed relative to each other, and each having a securingflange 32" by means of which the scraper may be secured to the inner combustion tube. The scrapers are so arranged that upon a rotation of the inner combustion tube with reference to the wick, the latter is rubbed smooth by the lower edge of the scrapers engaging therewith. To permit such rotation of the inner combustion tube, the upper end thereof is; freely rotatable relative to having a central aperturethat the inner combustion the removal of charred portions with are the wick stop fingers7. -These fingers lie immedlatel below the partition 21 and project radial y outwardly through suitable openings provided in the peripheral wall of the inner combustion tube, and are movable into position directly over the wick 3. It will be observed that the inner combustion tube, with the fingers 7 engaging in the apertures provided therefor 1n the tube, provides a support for the wick sto device. I

he operating means for the wick stop device preferably comprises a member 35 slidable vertically upon the sleeve 23, and a bearing member 36 pivotally connected by means of a plurality of inclined links 37 to the upper ends of the spring arms 33. Said vertically slidable member 35 has at its upper end an annular portion or seat 38 upon which the bearing member 36 is adapted to rest, and at its lower end the member 35 has a perforated disc 39. Said disc is arranged to be slidably engaged by the free end of a central crank 40 of a crank rod 41 operable, by means ofthe crank arm 6. The bearing member 36 may bein the form of a ring with which the lower ends of the inclined links 37 have a pivotal connection, and the upper ends of said links may be connected tothe spring arms by means of pins 42 entered throughlugs 43 formed inte rally with said arms.

he parts are relatively arranged so that when the crank arm 6 is. operated to swing the crank 40 upwardly, the latter acting as a cam engages with the disc 39 and forces the member 35 together with the bearing member 36 upwardly, thereby forcingithe links 37 toward a horizontal position and the spring arms 33 and fingers 7 thereon outwardly, To position the wick- 3, the wick stop fingers must be held manually, by pressure upon the crank arin6, in t eir ope'rative position. When the crank arm is released, the action of the spring arms withdraws the stop fingers out of their position above the wick so that when the latter is lighted, the stop fingers are not subjected to the extreme heat of the flame.

The crank rod 41 may be mounted at its opposite ends in the upright portions or legs 44 of the U-shaped cross bar 20 fixed at the lower ends of the wick tubes, the

rod being thus disposed immediately above the horizontal portion of the cross bar. Topermit of the easy assembling or removal of the crank rod, the opening in the end of the cross bar adjacent the arm 6 is in the form of a notch 45 closed by' means of a screw 46. The opposite end of the cross bar is bent to form a stop arm 47 which together with the crank arm 6 normally prevents an endwise movement of the rod. It will be seen that by removing the screw 46, the rod may be swung out of engagement with the notch 45, whereupon the arm 47 may be withdrawn from its'opening in the op osite end of the cross bar.

referably the free end pf the arm 47 of the crank rod is bent inwardly, parallel to the mainportion ofthe rod to form a stop 48 (Fig. 4) arranged to engage with the lower ends of the wick tubes'or limit the movement" of the crank arm 6 in one direction, and to limit the movement of said crank arm inthe other direction, when the inner combustion tube and wick stop device carried thereby have been removed, a pin 49 may be provided (Fig! 10), which may a with the ring 34 and extend upwardlythrough the partition 21 into engagement with the partition 27 at the upper end of the lower section of the inner combustion tube. These stop members may, if desired,

be reinforced by metallic strips 51 secured upon the braces 50 as by spot welding.

To prevent the too free passage of air -upwardly into the inner combustion tube 5 through the space between the annular ring 34 of the wick stop device, and the inner combustion tube, I provide .at the lower end of the latter an annular member having an inwardly projecting flange 52. a

It will be seen that I have produced a blue flame burner of a very practical character. I The outer combustion tube may be supported for movement with reference to the, outer wick tube without materially interfering with the free passage of air to the combustion space when the outer combustion tube is in operative position; Should the upper portion of the inner combustion tube become materially injured by reason of the extreme heat to which it is subjected in use, it may be readily removed and a new one substituted. The wick stop device is capable of easy operation and is of, an efiicient character by reason of the fact that the wick stop fingers are not only capable of being withdrawn from the flame after the wick is lighted but also cannot be left in their extended or operative position by a careless user to the detriment of the fingers 7 as well as to the even and eflicient burnin of the wick.

hile I have herein described the invention with considerable particularity, it will ited except as" may be necessitated by the state of the prior art.

I claim as my invention- 1. An oil burner comprising, in combination with a pair of concentric wick tubes, an inner combustion tube having a portion entered within the inner wick tube and supported in spaced relation with reference thereto, an outer combustion tube movable independently of the inner combustion tube, and means for supporting the outer combustion tube in either. raised or lowered "position with reference to the outer wick tube. 2. An oil burner comprising, in combination with a pair of concentric wick tubes, an outer combustion tube mounted upon the outer wick tube, an inner combustion tube having a portion depending within the inner wick tube, a central su port within said inner wick tube for said inner combustion tube, and a wick stop device within said depending port-ion of said inner combustion tube having a sto finger movable radially into and out of t e ath of movement of the wick guided by said wick tube 3. An oil burner comprising, in combination, a pair of concentric wick tubes having a transverse member at their lower ends,

an inner combustion tube having a central stem rigid therewith and detachably mounted on said transverse member, and an outer combustion tube adapted to be seated upon the outer wick tube and movable independently of the inner combustion tube.

4. An oil burner comprising, in combination with a pair of concentric wick tubes, an

inner combustion tube stationarily supportedwith reference to the inner wick tube, a wick stop device operatively associated with said inner combustion tube so as to be movable into and out of the path of movement of a wick guided by the wick tubes, and an" outer combustion tube mounted upon the outer wick tube for movement independently of said stationary innercombustion tube. v

5. An oil burner comprising, in combination with a. pair of concentric wick tubes 'and an inner combustion tube, an outer combustion tube having ahits lower end a plurality of spaced depending supporting lugs, a. plurality of radially extending supports mounted upon the outer wick tube and adapted to support the lugs thereon and spaced apart so as to be capable of receiving the lugs the'rebetween;

6. An oil burner comprising, in combination with a pair of concentric wick tubes, an inner combustion tube of less diameter than the inner wick tube and having a central support rigid with said tube, an outer combustion tube, and means for" supporting the, outer combustion tube either upon the outer wick tube or in spacedrelation with reference thereto.

7. An oil burner comprising, in combination with a pair-of concentric wick tubes and an outer combustion tube, an inner combustion tube havin a central stem, and a, transverse member wick tubes and having said stem detachably secured thereto.

8. An oil burner comprising, in fcombina tion, a pair of concentric wick tubes, an outer combustion tube supported for vertical movement with reference to the outer wick tube, an inner combustion tube fixed against "vertical movement with reference to the inner wick tube, and a wick stop device carried solely by said inner combustion tube xed with reference tosaid and com rising a plurality of spring arms I having ngers movable radially into and out of position above a wick carried by said wick tubes. I

9. A. blue-flame burner having an inner wick tube, an outer wicktube, a perforated combustion tube mounted u on the outer wick tube, and a tube exten ing axially of and within the inner wick tube and oomprising a perforated portion extending above and independent of any connection with the upper end of the inner wick tube.

bustion tube adapted to be rotated relative to the outer tube and having a wick-scraping device adapted to project radially therefrom so as to be engageable by said wick in its vertical movement.

. 12. An oil burner comprising,'-in com 'bination with a pair of concentric wick tubes and an outer combustion tube, an inner combustion tube having a top wall, a supporting stem carried by said wick tubes and having said to wall of the inner combustion tube rotatab y mounted thereon, and. a; plurality of wick stop fingers carried by said inner combustion tube.

13. An oil burner comprising, in combination with a pair of concentric wick tubes and an outer combustion tube, an inner comlltl bustion tube, a supporting stem rigid with said wick tubes and having said inner combustion tube mounted thereon so as to rotate relative thereto, and a wick scraper fixed on said inner combustion'tube and comprising an upright portion, the lower edge of which is adapted to be operatively engaged by a wickcarried by said wick tubes.

14;. An oil burner comprising, in com bination, a pair of concentric wick tubes, an inner combustion who supported entirely .free of and in spaced relation with reference to the upper end of the inner wick tube, an.

combustion tube, and a plurality of wick stop fingers carried by said inner combustion tube. 7

15. The combination of a pair of concentric wick tubes, an inner combustion tube mounted for rotation relative to said wick tubes while held against vertical movement, and a plurality of wick stop fingers carried by said combustion tube.

16. The combination of a pair of concen tric wick vtubes, an inner combustion tube fixed against vertical movement with reference to the inner wick tube, an outer combustion tube mounted for movement with reference to the outer wick tube, and a wick stop device carried wholly by said inner combustion tube and comprising a plurality of radially movable fingers.

1.7. The combination with a pair of concentric wick tubes and an outer combustiontube, of an inner combustion tube, a wick stop device carried by said'inner combustion tube, and-means for removably supporting the inner combustion tube in spaced relation with reference to the inner wick tube but normally holding it against vertical movement.

18. An 'o-il burner comprising, in combination with a pair of concentric wick tubes and an inner combustion tube, anouter com bustion tube having at its lower end a plurality of spaced dependent lugs, a plurality of pins extending radially outwardly from the outer wick tube and adapted to support the lugs thereon, said pins being spaced apart so as to be capable of receiving the.

an inclined wall upon which it is adapted to ride up and down upon the pins and each having a stop on its lower end for limiting its movement relative to said pins in one direction.

19. An oil burner comprising, in combination with a pair of concentric wick tubes and an inner combustion tube, an outer combustion tube having anannular member at its lower end and a plurality of radially extending pins on the outer wick tube with which said member is adapted to cooperate to support the outer combustion tube in their raised or lowered position, said annular member havin a series of openings therein which permit t e passage of air through the outer combustion tube when in its lowermost position.

20. An 011 burner compr1s1ng,1n combination with a pair of concentric wick tubes and an inner combustion tube, an outer combustion tube having an annular member at its lower end, an annular seat on the outer wick tube for said outer combustion tube, a series of depending lugs on said annular tions together,

space between the-combustion tubes.

21. An oil burn r p i ing, in combination with a pair of spaced concentric wick tubes and an outer combustion tube, an inner combustion tube comprising two sections, and means for securing said sections together and supporting them in spaced relation relative to the inner wick tube.

22. An oil burner comprising in combination with a pair of concentric wick tubes and an outer combustion tube, an inner combustion tube comprising twosections of substantially equaldiameter, the lower section being adapted to depend into said 'wick tube, 35 and means for securing said sections together and supporting them against vertical movement. Y

23. An oil burner comprising, in combination with a pair of concentric wick tubes and an outer combustion tube, an inner combustion tube formed in two sections and supported with reference to the inner wick tube, and means for'detachably securing said sec- '95 24. An oil burner comprising, in combination with a pair of concentric wick tubes and an outer combustion tube, an inner combustion tube comprising a lower section of substantially less diameter than the inner wick tube and having an annular seat at its upper end and an upper section substantially equal in diameter to that of the lower section and having an inwardly flared. lower end adapted to be seated upon said annular seat of the lower section. w

25. An oil burner comprising, in combination with a pair of concentric wick tubes and an outer combustion tube, an inner combustion tube having a partition fixed against vertical movement in its lower end, a central supporting rod having a fixed member on its upper end and dependingthrough the inner combustion tube, a transverse member fixed with reference to said Wick tubes into which said rod is adapted to be threaded, a nut on the lower end of said rod, and a sleeve between said nut and said partition, whereby said inner combustion tube is held against vertical movement.

26. An oil burner comprising, in combination with a pair of concentric wick tubes and an outer combustion-tube, an inner combustion tube comprising a lower section and an upper section seated thereon, a rod having a fixed head .on its upper end and depending-through said inner combustion tube, a transverse member fixed upon the lower end of said wick tubes, a nut on the;lower end of said rod above said transverse member,

and a sleeve on the rod bearing between said nut and said upper section whereby to hold the sections together and support them against vertical movement.

27. An oil burner comprising, in combination with a pair of concentric wick tubes, an outer combustion tube, and an inner combustion tube having a series of openings in its peripheral wall, a

outer combustion tube and an inner combus-' tion. tube, a wick stop device comprising a plurality of spring arms each having a stop nger movable radially into position over a wick carried. by said wick tubes, and means for moving said fingers comprising a vertically movable member and a series of inclined links connecting said .member with the upper ends of-said arms, and means for arms,

moving said vertically movable member.

29. An oil burner comprising, in combination with a pair of concentric wick tubes, an o ter combustion tube and. aninner combusa wick stop device comprising an annular ring having a plurality of vertically disposed spring arms, a plurality of wick stop fingers at the upper ends of said a vertically movable member, a plurality of inclined links pivotally connecting said member with said arms, a second vertically movable member bearing against the first movable member, and a crank rod adapted to engage with the second member to move the first member and thereby said fingers radially outwardly against the action of the spring arms.

30. An oil burner comprising, tion with a pair of concentric wick tubes, an outer combustion tube and an inner-combustion tube, a wick stop device comprising a plurality of vertically disposed'spring arms, a vertically movable member,'a plurality of inclined links pivotally connecting said member with the upper ends of said arms, a second vertically movable member adapted to engage with the first member, a crank rod rotatably mounted at the lower ends of the wick tubes, said second movable member having a disc adapted to be engaged by said crank and a crank arm operable to swing said crank and through said movable members and said links the spring arms outwardly, there beinga plurality of stop fingers on said arms adapted to overlie a wick entered between said wick tubes.

ers at their upper" in co mbinanaea oee 31. An oil burner comprising, in combination with. a pair of concentric with tubes, an outer combustion tubeand'an inner combustion tube, means for supporting said inner combustion tube against vertical movement relative to theinner wick tube, and, a. wick stop device comprising a plurality of fingers, means whereby said fingers may be manually held in position above a wick carried by said wick tubes, and means normally moving said fingers into -inoperative position at one side of the vertical plane of said wick. I

32. An oil burner comprising, in combination with a pair of concentric wick tubes, an outer combustion tube and an 11111812 combustion tube, a wick stop device comprising a plurality of stop fingers movable into wick carried by'said wick position above a withdrawn therefrom,

tube but normally and means for manually holding: said fingers in their operative position.

33. An oil burner comprising, nation with a pair of concentric wick tubes and an outer combustiontube, an inner combustion tube having a central upright rod extending therethrough, a wick stop device comprising a plurality of spring arms each having a radially movable wick stop finger thereon, a member guided for vertical movement by said rod, means including a manually operable crank for moving said member vertically, and means connecting said member with said spring arms whereby an operation of said crank will move said stop fingers radially outwardly.

'34. An oil burner comprising, in combination with a pair of concentric wick tubes,

in combian outer combustion tube and an inner combustion tube, a wick stop device comprising a plurality of radially movable stop fingers, a vertically movable member voperatively associated with said fingers, means for moving said member in one direction whereby to move said fingers outwardly and spring means adapted to move said member in the opposite direction whereby to cause said fingers to move inwardly.

35. An oil burner comprising, in combi-' nation with a pair of concentric wick tubes, an outer combustion tube and an inner combustion tube, a wick stop device comprising a plurality of radially movable stop fingers, a vertically movable member operatively connected with said fingers, and means including a cam adapted to slidably engage said member to move it vertically and thereby said fingers outwardly.

36. 'A blue-flame burner having a wick tube and. an inner combustion tubedepending a substantial distance into said wickv tube and sup-ported entirely free of and in of said tube.

37. A. blue-flame burner having, in com bination with a wick tube, an inner combustiontube of less diameter than thewick tube, and means carried by the wick tube .stop device com rising a laterall disposed with its lower end sectionand a lower section, and

and extending upwardly in the'combustion tube 'to support .it independently of the upper end'o the Wick tube. I

u 38. A'blue flame oil burner having two concentric wick tubes and two concentric combustion tubes, the inner one of said combus'tion tubes being stationarily supported depending within the inner wick tube but spaced therefrom, and the outer one of the, said combustion tubes being mounted for vertical movement independently of the inner combustion tube.

. 39. In a blue flame oil'burner, a perforated combustion tube comprising an upper means for securing said sections together whereby to permit of the detachment of the upper section from the lower section.

40. A blue-flame burner having, in com bination with a pair of concentric tubes ada ted to receive a wick means arranged to c, moved into and held manually in position above said wick, said means automatically returning to its inoperative position u on being released.

41. blue-flame burner having two per forated concentric combustion tubes, the

' inner one of which is rotatable independently of the outer one while held against vertical movement. a

'42. A blue-flame burner having two perforated concentric combustion tubes, one of which (has a laterally projecting member thereon and is rotatable independently of the other one of said tubes while held against upward movement.

43. A blue fiame oil burner, having, in combination with a vertically movable wick, aninner combustion tube, and a wick stop device carried wholly by said tube and comadapted to 'be prising a laterally movable finger, a vertically movable operating member for said finger, and means for holding said finger against vertical movement.

A blue-flame oil burner comprising, in combination with a vertically movable wick, a' laterally movable wick stop finger manually held in position abovethe wick, said finger automatically returning to inoperative position when released.

45. A blue-flame oil burner having a vertically movable wick, an inner combustion tube,and a wick stop device comprisinga stop finger movable into and out of position above the wick while in operative position. p 46. A blue-flame oilburner having a wick, an inner combustion tube, an outer combustion tube movable independently of the inner tube, and a wick stop device comprising a stop finger movable into and out'of 'po-' the combustion tube is sition above the wick while the inner coinbustion tube is in operative position. I

47. A blue-flame oil burner having a wick finger, a vertica y movable mem r' operatlvely connected to said finger, and manually operable means for operating said memher and thereb said finger.

48. In an oil burner, the combination of an'annular wick mounted for up and down movement, a pair of combustion tubes mounted in s d concentric relation in operative association with said wick, the inher one of said tubes having a portion depending into the wick for rigid support therein, a wick stop finger havinga support within said inner tube and a portion movable into and out of the path of movement of the wick, said inner combustion tube having an aperture for receiving said portion of the finger, and the outer one ofsaid combustion tubes having supporting having an aperture in its wall located in a horizontal plane a short distance above the wick tubes, a wick stop finger having a part operable through said opening in the inner combustiontube into and out of the path of movement of said wick, an outer combustion tube, and means for supporting said outer combustion tube either in lowered or operative position with reference to said wick or in raised or inoperative position above said wick. i

50. In an oil burner, the combination of a pair of spaced concentric Wick tubes, an annular wick mounted for up and down movement in said tubes, an inner combustion tube, awick stop device, means for stationarily supporting said inner combustion tube so as to. provide a support for said wick stop device, an outer combustion tube, and means for supporting said outer combustion tube either in lowered or operative position with reference to said erative position above said wick;

51. A blue flame oil burner comprising, in combination, a pair ofspaced concentric wick or in raised or inop wick tubes, an annular wick guided by said A the outer combustion tube comprising an annular member'on the lower end thereof having depending lugs with inclined edges, and a series of stationary pins adapted to be engaged by said lugs.

53. An oil burner having, in combination with an inner combustion tube, an outer tral stationary support, and a pair of concentric combustion tubes one of which is rotatably mounted upon the upper end of said support.

55. a. blue-flame oil burner comprising, in

combination, a'wick tube, and a combustion tube having a supporting member secured thereto and adapted to be detachably mounted relative to said wick tube, said combustion tube having a portion depending into the wick tube but in spaced relation relative thereto.

56. A blue-flame oil burner comprising, in combination, a pair of spaced concentric wick tubes, an annular wick guided by said tubes for up and down movement, a combustion tube fixed with reference to the inner wick tube, means operatively associated with said inner combustion tube to limit the upward movement of said wick, an outer combustion tube, and means for supporting said outer combustion tube upon said outer wick tube either inoperative or lowered position with reference to said wick or in inoperative or raised position with reference to the wick, said supporting means for the outer tube being operable to vary the position of the tubewith' reference to the wick by a rotation in either direction of the outer combustion tube with reference neeaoee to the inner combustion tube and said wick tubes.

57. In an oil burner, the combination with a pair of concentric wick tubes adapted to receive a wick therebetween for vertical movement, of a wick stop device for limiting the vertical. movement of the wick, said device comprising a finger movable radially with respect to said tubes, and means operable from one end of the burner for moving said finger into its operative position over the wick.

58. In an oil burner, the combination with a pair of concentric wick tubes having a wick movable longitudinally therebetween,

of means operable from an inoperative position at one side of the wick to an operative position over the wick whereby to limit the upward movement thereof, and means operable from the exterior of the burner for actuating the last mentioned means.

59. In a blue-flame oil burner the com bination with a vertically movable wick, of a wick stop member movable into and out of operative position with respect to said wick, a pair of combustion tubes mounted concentrically with respect to each other and said wick, and means extending axially through the burner for actuating' said member. 1

60. In an oil burner, the combination with a vertically movable annular wick, a plurality of wick stop devices located upon the inner side of said wick, and means mounted I for up and down movement in the burner and operatively associated with said wick stop devices whereby to effect their movement either from an inoperative position at the inner side of the wick or to an operative position over the wick.

In testimony whereof, I have hereunto set my hand.

- RUDOLPH HOFFMAN. 

